55534440 has 128 divisors (see below), whose sum is σ = 181762560. Its totient is φ = 13492224.

The previous prime is 55534411. The next prime is 55534441. The reversal of 55534440 is 4443555.

It is a super-2 number, since 2×55534440² = 6168148052227200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 55534398 and 55534407.

It is not an unprimeable number, because it can be changed into a prime (55534441) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 151137 + ... + 151503.

It is an arithmetic number, because the mean of its divisors is an integer number (1420020).

Almost surely, 2^55534440 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55534440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (90881280).

55534440 is an abundant number, since it is smaller than the sum of its proper divisors (126228120).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55534440 is a wasteful number, since it uses less digits than its factorization.

55534440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 491 (or 487 counting only the distinct ones).

The product of its (nonzero) digits is 24000, while the sum is 30.

The square root of 55534440 is about 7452.1433158522. The cubic root of 55534440 is about 381.5230655041.

Adding to 55534440 its reverse (4443555), we get a palindrome (59977995).

The spelling of 55534440 in words is "fifty-five million, five hundred thirty-four thousand, four hundred forty".